Armature-testing device.



L. H. SEYRANIAN. ARMATURE TESTING DEVICE. APPLICATION FILED DEG. 29, 1908.

Patented Nov. 1, 1910.

UNITED SATE 4 Lnvon H. SEYRANZIAN, or MONTEBEY, CALIFORNIA.

ABMATURE-TESTING DEVICE.

v Patented Nov. 1, 191a. SeriaLNo. 469,879.

To all whom it may concern:

Be it known that I, LEVON H. SEYRANIAN, a citizen of the United States, residing at Monterey, in the county of Monterey'and State of California, have invented new and useful Improvements in Armature-Testing Devices, of which the following is a specification.

This invention relates to a device designed for use by armature winders, repairers and inspectors, whereby faults such as short circuits, open circuits, grounds, cross connections, etc., can be easily, quickly and effectively located.

The invention has for one of its objects to improve and simplif the construction and operation of devices 0 this character so as to be comparatively simple and inexpensive to manufacture, and convenient to manipulate.

Another object OI the invention is the provision of a testing device consisting of a plurality of contacts so arranged as to engage adjacent commutator bars whereby the coils or windings connected with such bars will be connected in circuit with a source of cur rent, a telephone receiver, and a buzzer, so as to determine, by the tone or absence of sound in the receiver, the condition of the armature coil or winding being tested.

WVith these objects in view and others, as will appear as the description proceeds, the invention comprises the various novel features of construction and arrangement of parts which will be more fully described hereinafter and set forth with particularity in the claims appended hereto.

In the accompanying drawing, which illus trates one embodiment of the invention, F igure 1 is a diagrammatic view of the circuit connections of the .tester. Fig. 2 is a longitudinal section of the instrument. Fig. 3 is a plan view thereof with a portion 'broken away. Fig.4 is a transverse section on line 44, Fig. 2. i

Similar reference characters are employed to designate corresponding parts throughout the views.

Referring to the drawing, A designates the body of the instrument which is preferably constructed in the whereby the operator can conveniently grip the same, the said body being'composed of a central section 1 and top and bottom secreliable and efficient in use,

form of a handle tions 2 and 3, the sections being secured together by screws 4 or other fastenings which have their heads countersunk so that the handle will be perfectly tral section 1 has a projecting tongue 5 at one end which has its under side beveled at 6, and on this projecting tongue are two L-shaped contact pieces 7 secured in place by screws or other fastenings 8, the contact pieces being separated from each other and insulated by the wood or other material of which the handle is constructed. The opposite faces of the inner section are provided each with two sets of longitudinal channels 8 for accommodating the lead-in wires 9 and 10, the said wires being provided with terminal clips 11 and 12 for receiving screws 13 for securing the clips with the contacts 7 and 14, respectively. The contacts 14-are in the form of leaf springs t-hat project out of the end of-the handle under the tongue 5 and these contacts are normally sprung away from the depending extremities 15 of the contacts 7. Each contact 7 cooperates with a contact 14 to form a circuit closer, so that the circuit will be completed when the contacts engage. The contacts 14 can be moved toward or away from each other on the screws 13 as pivots so as to bring the extremities or tips of the contacts in proper relation to the commutator bars of the armature.

The instrument is adapted to be connected in circuit with a battery B or other source of continuous current and this battery is connected by a wire 16 with one of the contacts 14 and by a wire 17 with the buzzer G for causing intermittent current and this buzzer is connected with the other contact 14 by a wire 18.- The fixed contacts 7 are connected, respectively, by'wires'19 and 20 to an ordinary telephonic receiver 21.

In practice, the operator grasps the handle A in one hand and .holds the receiver with the other hand to his ear and then places the contacts 14 upon the commutator bars connected with the coil or winding to be tested. While the instrument is held in this position, pressure is applied to spring the contacts 14 into engagement with the contacts 7 "so as to thereby complete the circuit in which the buzzer and receiver are included. If the armature coils are all right when contact is made by members 14 at the smooth. The cenion commutator bars, the buzzer will operate uniformly for each coil of the same armature and produce a like sound in the receiver. If any one of the coils tested is short cir- Jcuited the operation of the buzzer will vary and the resultant sound in the receiver will change, and should the connections of a coil be loose, or the winding broken and the ends of the broken wire in contact the buzzer will operate differently and produce a sound in the receiver readily distinguishable from the sounds resulting from the aforementioned conditions. An open circuited armature coil would fail to cause a flow of current through the buzzer, hence no sound would be given in the receiver. To determine if any one of the coils is grounded or not bring one of the members 1 1 in'contact with the armature shaft and the other member 14 in contact with the commutator bar of the coil to be tested; a current through the buzzer indicates that the coil is grounded and no sound that the coil is all right.

From the foregoing description, taken in connection withthe accompanying drawing, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the invention appertains," and while I have descfibed the principle of operation of the together with the apparatusinvention, which I now consider to be the best embodiment thereof, I desire to have it understood that the apparatus shown is merely illustrative, and that such changes may be made when desired as are within the scope of the claims appended hereto.

Having thus described the invention, what I claim is;

1. An armature testing device comprising two movable contacts forming terminals of an electric circuit including a buzzer and adapted to make electrical connection with two commutator bars, and two fixed con- 3. An armature-testing device comprising a handle composed of sections, said handle having channels, lead-in wires disposed in the channels, fixed contacts connected with certain of the wires, and spring contacts connected with the other wires, said spring contacts being normally separated from and disposed opposite from the fixed contacts respectively and projecting beyond the same to be brought into contact with a pair of commutator bars for testing the windings of an armature.

In testimony whereof I affix my signature in presence of two witnesses.

LEVON' H. SEYRANIAN.

Witnesses:

J. SHERMAN WOOLF, WILLIAM SANDHoLD'r. 

